Lec36 Fill In Notes (1)

Lec36 Fill In Notes (1) - Define ρ = density of air 1.1...

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Lec36 Fill In Notes Solar energy: Max current flow: 2.5 x 10 21 electrons per second [e/s] Def: 1 ampere = 1 A = 6.241 x 10 18 e/s Distribution of photon energy (approx) ~ Weibull (3,3) where x is energy in 10 -19 joule Example: What percent of photons have energy < 1 x 10 -19 J? Let x = 1 P(X <= 1) = 1 – exp(-(1/3)^3) = 0.036 For PV panel power Recall ( from physics ): Power = Current * Voltage Example: Suppose current = 1 A/m 2 , voltage = 0.5 V Then P = IV = 0.5 watt/m 2 Wind energy Recall ( from physics ): Energy = Power * Time [e.g., watts * hours = watt-hours]
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Unformatted text preview: Define ρ = density of air 1.1 kg/m 3 h bin = number of hours/yr in bin V bin as bin avg wind speed [m/s] A = swept area of wind turbine [m 3 ] Then energy in bin E bin equals [watt-hr/yr]: Empirical E bin : download table of hours from web Theoretical E bin : use Weibull CDF. See Lec.18 Let x lo & x hi = lower and upper windspeeds for bin, resp.; x avg = average of x lo & x hi Then >>> simplify and solve...
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